1 /* 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_CODE_PCDESC_HPP 26 #define SHARE_VM_CODE_PCDESC_HPP 27 28 #include "memory/allocation.hpp" 29 30 // PcDescs map a physical PC (given as offset from start of nmethod) to 31 // the corresponding source scope and byte code index. 32 33 class nmethod; 34 35 class PcDesc VALUE_OBJ_CLASS_SPEC { 36 friend class VMStructs; 37 private: 38 int _pc_offset; // offset from start of nmethod 39 int _scope_decode_offset; // offset for scope in nmethod 40 int _obj_decode_offset; 41 42 enum { 43 PCDESC_reexecute = 1 << 0, 44 PCDESC_is_method_handle_invoke = 1 << 1, 45 PCDESC_return_oop = 1 << 2 46 }; 47 48 int _flags; 49 set_flag(int mask,bool z)50 void set_flag(int mask, bool z) { 51 _flags = z ? (_flags | mask) : (_flags & ~mask); 52 } 53 54 public: pc_offset() const55 int pc_offset() const { return _pc_offset; } scope_decode_offset() const56 int scope_decode_offset() const { return _scope_decode_offset; } obj_decode_offset() const57 int obj_decode_offset() const { return _obj_decode_offset; } 58 set_pc_offset(int x)59 void set_pc_offset(int x) { _pc_offset = x; } set_scope_decode_offset(int x)60 void set_scope_decode_offset(int x) { _scope_decode_offset = x; } set_obj_decode_offset(int x)61 void set_obj_decode_offset(int x) { _obj_decode_offset = x; } 62 63 // Constructor (only used for static in nmethod.cpp) 64 // Also used by ScopeDesc::sender()] 65 PcDesc(int pc_offset, int scope_decode_offset, int obj_decode_offset); 66 67 enum { 68 // upper and lower exclusive limits real offsets: 69 lower_offset_limit = -1, 70 upper_offset_limit = (unsigned int)-1 >> 1 71 }; 72 73 // Flags should_reexecute() const74 bool should_reexecute() const { return (_flags & PCDESC_reexecute) != 0; } set_should_reexecute(bool z)75 void set_should_reexecute(bool z) { set_flag(PCDESC_reexecute, z); } 76 77 // Does pd refer to the same information as pd? is_same_info(const PcDesc * pd)78 bool is_same_info(const PcDesc* pd) { 79 return _scope_decode_offset == pd->_scope_decode_offset && 80 _obj_decode_offset == pd->_obj_decode_offset && 81 _flags == pd->_flags; 82 } 83 is_method_handle_invoke() const84 bool is_method_handle_invoke() const { return (_flags & PCDESC_is_method_handle_invoke) != 0; } set_is_method_handle_invoke(bool z)85 void set_is_method_handle_invoke(bool z) { set_flag(PCDESC_is_method_handle_invoke, z); } 86 return_oop() const87 bool return_oop() const { return (_flags & PCDESC_return_oop) != 0; } set_return_oop(bool z)88 void set_return_oop(bool z) { set_flag(PCDESC_return_oop, z); } 89 90 // Returns the real pc 91 address real_pc(const nmethod* code) const; 92 93 void print(nmethod* code); 94 bool verify(nmethod* code); 95 }; 96 97 #endif // SHARE_VM_CODE_PCDESC_HPP 98